My 2002 Pontiac Montana sometimes won't start?

Tiny
JEMFRANKS
  • 2002 PONTIAC MONTANA
  • 140,000 MILES

I have spark and fuel in the fuel rail. Have changed plugs and wires, fuel filter and starter. Weather does not seem to be a factor. Once the engine is running it runs great. My mechanic says he does not know what it is, he said we would have to start changing sensor. Do you have any ideas?

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Wednesday, March 28th, 2012 AT 11:41 PM

13 Replies

Tiny
DJCL
  • EXPERT
  • 786 POSTS

Are there aney pcm codes. If yes what are thay. We need to know if we are having a spark or fuel. Problem. Check fuel pressure check spark @ the plug on 2 wires. Let me know how you make out.

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Thursday, March 29th, 2012 AT 1:08 AM
Tiny
JEMFRANKS
  • MEMBER

There are no codes, fuel pressure is 50 psi, checked spark on the front three plugs and I have spark on all three.

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Thursday, March 29th, 2012 AT 10:45 AM
Tiny
DJCL
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Is this what you have when its not starting?

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Thursday, March 29th, 2012 AT 11:41 AM
Tiny
JEMFRANKS
  • MEMBER

When it is not running I still have spark and 50 psi fuel pressure.

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Thursday, March 29th, 2012 AT 2:12 PM
Tiny
FIXITMR
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Are injectors working when no start happens?

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Friday, March 30th, 2012 AT 3:48 AM
Tiny
JEMFRANKS
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Don't know how do I test.

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Friday, March 30th, 2012 AT 10:26 AM
Tiny
DJCL
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You mentioned there is inject or pulse but not if there is spark on the front 3 when not starting. Check this and get back to me

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Friday, March 30th, 2012 AT 3:08 PM
Tiny
FIXITMR
  • MEMBER

Noid light is usual test. You can buy or make your own. Someone mentioned harbor freight has set for $10

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Friday, March 30th, 2012 AT 3:53 PM
Tiny
JEMFRANKS
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Don't understand what you mean djcl. Fixitmr could a bad signal or short for the pcm be intermitant. I'm thinking it might be the injectors because the last time I had a no start I tried to get it started until the battery died and when I took the front plugs out they were dry as mummy dust. You would think after trying for so long they would be wet. Do you agree?

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Friday, March 30th, 2012 AT 7:25 PM
Tiny
FIXITMR
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Yes, I would expect them to show wet condition. Intermittant no signal/short sounds right.

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Friday, March 30th, 2012 AT 9:26 PM

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